It looks like they will sell him next summer for ridiculous amount of money(more than Coutinho even) and will use that money to completely rejuvenate and complete the squad.
What a jackpot of a signing has Salah been, it's almost unfathomable. Chelsea reject. Liverpool buy him for relatively cheap(something like €40m), he suddenly, unexpectedly explodes and becomes immediately the best right winger on the planet. Great for marketing because he's Arab(at least speaks Arabic, I'm not very knowledgeable about Egypt's demographics), and that's unique - he probably attracted a lot of North African/Middle Eastern/Arabian fans to support Liverpool.
And now, Saudis desperately want him as a face for their football league project. Even though he is in his thirties now, Liverpool will get massive money for him, maybe even break the Neymar transfer record, or at least close to it. Saudis are basically financing 3 of our rivals - Newcastle, Chelsea and most annoyingly, Liverpool...